JPH0536667Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is aimed at improving the terminal structure of vacuum-formed resin products, in particular by pasting a thermoplastic sheet material onto the surface of a core material by vacuum forming. It relates to the core material used in vacuum forming for bonding and forming, especially the shape of the end portion of the core material.

Conventional technology When vacuum forming a thermoplastic plastic sheet, such as a vinyl chloride sheet or a resin fabric sheet, after heating and softening it, ABS (acrylonitrile-butadiene-styrene resin), PP (Polypropylene) - Appropriate adhesive is applied in advance to the surface of a core material made of filler, etc., and a soft skin sheet is pasted onto the surface of the core material by vacuum suction, followed by bonding and shaping. Vacuum forming methods are widely known. For example, FIGS. 5 and 6 show vacuum-formed products using conventional core materials, and FIG. 5 is a sectional view of the part corresponding to the line - in FIG.
The figure shows a vacuum-formed product (center cluster of an automobile) viewed from the back, where 1 is a thermoplastic plastic skin sheet, 2 is a core material for vacuum forming, and 3
a and 3b are openings. For vacuum forming,
Adhesive 4 is applied to the surface of the core material 2 in advance, and at the same time as the skin sheet 1 is vacuumed, it is formed and adhered to the surface of the core material 2, and then the adhesive 4 is applied to the surface of the core material 2 several mm to 2 cm outward from the end of the core material 2. "Epidermal glue area"
The skin sheet 1 is cut around the entire circumference, leaving . .

According to such a conventional vacuum-formed core material, adhesive 4a is manually applied to the back surface of the entire circumference of the end portion of the core material 2 by brushing, and as shown in part A in FIG. Since the end portion 1a of the core material 2 must be rolled up to the back side of the core material 2 and crimped to such an extent that the skin sheet 1 does not peel off, the end treatment of the skin sheet 1 requires many man-hours. Furthermore, since the end portion of the core material 2 has a convex shape, wrinkles tend to occur in the skin sheet 1, as shown in part B in Fig. 6, and these wrinkles affect the appearance (design surface) of the molded product. This may reduce the adhesive strength between the skin sheet 1 and the core material 2 and cause peeling, or the skin sheet 1 may become thinner, causing the skin sheet 1 to become thinner, as shown in section C in Figure 6. There was a problem that peeling was more likely to occur.

Problems to be solved by the invention In view of the above-mentioned problems, the present invention reduces the number of man-hours required for vacuum forming work, especially the end treatment of the skin sheet material after vacuuming, and also eliminates wrinkles at the ends of the skin sheet. The purpose of the present invention is to provide an end structure for vacuum-formed resin products that prevents the occurrence of thin parts or thin parts.

Means for Solving the Problems In order to solve these problems, according to the present invention, a thermoplastic sheet material is attached to the surface of the core material by vacuum forming, and a thermoplastic sheet material is attached to the surface of the core material. In a vacuum-formed resin product formed by adhesion and molding, the core material has a cross-sectional shape at the end thereof in a relatively gentle rounded (R) shape on the surface of the core material, and the edge of the rounded shape is connected to the flat surface of the cut. There is provided an end structure for a vacuum-formed resin product, characterized in that the plastic sheet material pasted on the surface of the core material is cut along the same plane as the cut plane part.

EXAMPLE FIG. 1 is a cross-sectional perspective view of a molded product using the vacuum forming core material of the present invention, and FIGS. 2 to 4 show the molding process. In these figures,
1 is a skin sheet of thermoplastic plastic, and 2 is a core material for vacuum forming. Core material 2 is ABS, PP-
It is made of a resin material such as filler, and is formed into a cup shape with a substantially uniform wall thickness, and its convex side is the vacuum-formed surface. The end portion of the core material 2 forms a relatively gentle rounded (R) shaped portion 2a in cross section over the entire circumference on the molding surface side, as shown in the figure, and a cross section 2a on the back surface side of the core material 2. A cut plane part 2b consisting of an L-shaped step is formed, and the edge 2c of the R-shaped part 2a is connected to the cut plane part 2b forming an angle of about 90 DEG with the edge surface.

Adhesive 4 is applied to the entire surface of the core material 2 including the R-shaped portion 2a just before vacuuming, and the cup-shaped core material 2 is moved to the appropriately heated skin sheet material 1 side. At the same time, vacuum is drawn in the direction of the arrow in FIG. As a result, the skin sheet material 1 is pasted onto the surface of the core material 2 along the surface shape and bonded with the adhesive 4.
Furthermore, as shown in FIG.
It is rolled up along the cut plane part 2b up to the end edge 2c which is in contact with the cut plane part 2b, and is simultaneously bonded with the adhesive 4a of this part 2a. After complete adhesion, as shown in FIG.
A is cut around the entire circumference of the core material 2.

Effects of the Invention As described above, according to the present invention, it is possible to apply adhesive over the entire surface of the core material 2 including the R-shaped portion 2a.
Since the skin sheet material 1 is applied smoothly, wrinkles and thin parts do not occur at the ends of the skin sheet 1 after molding, which not only prevents peeling of the skin sheet 1 but also improves the appearance. A molded product with excellent design can also be obtained in this respect. In addition, manual work, which was required with conventional technology,
Cutting of the skin sheet leaving the "skin margin" at the end, applying adhesive to the end of the core material,
It becomes unnecessary to wrap the outer skin end portion onto the back surface of the core material, and therefore the vacuum forming process, particularly the end treatment work of the outer skin sheet material, is simplified and the number of man-hours can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional perspective view of the terminal structure of the vacuum-formed resin product of the present invention, and FIGS. 2 to 4 are diagrams showing the process of vacuum forming the terminal structure of the vacuum-formed resin product of the present invention. Fig. 5 is a cross-sectional view taken along the line - in Fig. 6 of a molded product using a conventional core material for vacuum forming, and Fig. 6 is a view from the back of a molded product using a conventional core material for vacuum forming. . DESCRIPTION OF SYMBOLS 1...Skin sheet, 2...Core material, 2a...R portion, 2b...Cut plane part, 2c...
Edge, 4...Adhesive.

Claims (1)

[Scope of utility model registration request] In a vacuum-formed resin product made by adhering a thermoplastic sheet material 1 to the surface of a core material 2 by vacuum forming, adhering and molding it to the surface of the core material, the core material 2 has a cross-sectional shape at the end portion. The core material surface has a relatively gentle rounded (R) shape 2a, and the edge 2c of the rounded shape is connected to the cut plane part 2b, and the plastic sheet material 1 pasted on the surface of the core material 2 is An end structure of a vacuum-formed resin product, characterized in that it is cut along the same plane 6 as the cut plane part 2b.